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Measures Of Dispersion

ICSE · Class 11 · Economics

Practice quiz for Measures Of Dispersion — ICSE Class 11 Economics. MCQs and questions with answers to test your preparation.

52 questions40 flashcards5 concepts

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Quick Quiz: Measures Of Dispersion

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1

A continuous series has class intervals 0-10, 10-20, 20-30, 30-40, and 40-50. Using Method II, what is the range?

2

In the grouped data 1-10, 11-20, 21-30, and 31-40, what is the range after converting to exclusive form?

3

A frequency distribution has Q1 = 28 and Q3 = 52. What is the quartile deviation?

4

For an individual series of 7 items, the ordered values are 4, 6, 8, 10, 12, 14, and 16. What is Q1?

52 Questions·
multiple choicemultiple correct

Sample Questions

1multiple choice
3 marks

A series has X values 5, 7, 9, 11, and 13. What is the standard deviation by actual mean method?

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2.83

Mean = 9. Deviations are -4, -2, 0, 2, 4. Squares are 16, 4, 0, 4, 16. Sum of squares = 40. SD = √(40/5) = √8 = 2.83.

2multiple choice
3 marks

Using step deviation, values 10, 20, 30, 40, 50, 60, 70 with frequencies 3, 5, 7, 9, 8, 5, 3 and A = 40, C = 10 give what standard deviation?

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16.5

Step deviation values are -3, -2, -1, 0, 1, 2, 3. Compute Σfd' = 1 and Σfd'² = 109, N = 40. SD = √[109/40 - (1/40)²] × 10 ≈ 16.5.

3multiple choice
3 marks

Two groups have the same mean 53. Group 1 has N = 40 and SD = 19. Group 2 has N = 50 and SD = 8. What is the combined standard deviation?

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14

Since both means are 53, D1 = 0 and D2 = 0. Combined SD = √[(40×19² + 50×8²) / 90] = √(17640/90) = √196 = 14.

4multiple choice
3 marks

The values 3, 6, 9, 12, and 15 have mean 9. What is the variance?

Show answer

18

Deviations from mean are -6, -3, 0, 3, 6. Squares sum to 90. Variance = average squared deviation = 90/5 = 18.

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Frequently Asked Questions

What are the important topics in Measures Of Dispersion for ICSE Class 11 Economics?
Measures Of Dispersion covers several key topics that are frequently asked in ICSE Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Measures Of Dispersion — ICSE Class 11 Economics?
Understand the core concepts first, then work through the 52 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

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